Velukan Dragon {5}{R}{R}
Creature — Dragon
Flying
Whenever this creature attacks or blocks, roll a six-sided die. This creature gets +X/+0 until end of turn, where X is the result minus 1.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Freelance Muscle 82%
$0.14#17060
"Whenever this creature attacks or blocks, it gets +X/+X until end of turn, where X is the greatest power and/or toughness among other creatures you control."
Mana-Charged Dragon 82%
$1.33#18393
"Whenever this creature attacks or blocks, each player starting with you may pay any amount of mana. This creature gets +X/+0 until end of turn, where X is the total amount of mana paid this way."